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-8d-12=-20d
We move all terms to the left:
-8d-12-(-20d)=0
We get rid of parentheses
-8d+20d-12=0
We add all the numbers together, and all the variables
12d-12=0
We move all terms containing d to the left, all other terms to the right
12d=12
d=12/12
d=1
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